Rose colored metallic crystals
cone 10 oxidation
Firing With a long hold at 1850 deg F
A three hour hold at 1850 deg F
One hour hold at 1650 deg F
Clay body is a grolleg porcelain from Tacoma Clay Art Center.
There are two glazes shown, the first with the pink tinted crystals, and a
second for comparison.
I'd not previously seen that color metallic
crystals in a saturated iron glaze,
so found the compositionally closest
saturated iron glaze I'd tested with the above firing.
the first
glaze, with the rose colored crystals has a bit less alkali metal, and more
MgO.
glaze composition
These glazes have high alkali metal, the numbers in the Empirical or Seger Formula:
total alkali metals .73 resp .78
Li2O ~.18
molecular percent silica 63 %
The first glaze has molecular fraction alkali metals .73, MgO .13
The second glaze has molecular fraction alkali metals .78, MgO .06
I expect the higher MgO with lower total alkali metals is the difference
that accounts for the striking color.
None of my other high alkali
metal satuated iron glazes have this much MgO.
The pots are smll conical bowls ~3 inches in diameter. Inside and outside are shown. There is a decorative leaf print on the inside.
glaze iron_8_R_162_3Z_1
inside
outside
This glaze with the striking pink crystals has higher MgO, lower total alkali metals.
glaze iron_8_R_162_1Z_1
inside
outside